static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id) { struct platform_device *dev = dev_id; struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev); unsigned char sr; int wakeup; sr = iic_rd(pd, ICSR); pd->sr |= sr; /* remember state */ dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr, (pd->msg->flags & I2C_M_RD) ? "read" : "write", pd->pos, pd->msg->len); if (sr & (ICSR_AL | ICSR_TACK)) { /* don't interrupt transaction - continue to issue stop */ iic_wr(pd, ICSR, sr & ~(ICSR_AL | ICSR_TACK)); wakeup = 0; } else if (pd->msg->flags & I2C_M_RD) wakeup = sh_mobile_i2c_isr_rx(pd); else wakeup = sh_mobile_i2c_isr_tx(pd); if (sr & ICSR_WAIT) /* TODO: add delay here to support slow acks */ iic_wr(pd, ICSR, sr & ~ICSR_WAIT); if (wakeup) { pd->sr |= SW_DONE; wake_up(&pd->wait); } return IRQ_HANDLED; }
static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id) { struct sh_mobile_i2c_data *pd = dev_id; unsigned char sr; int wakeup = 0; sr = iic_rd(pd, ICSR); pd->sr |= sr; /* remember state */ dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr, (pd->msg->flags & I2C_M_RD) ? "read" : "write", pd->pos, pd->msg->len); /* Kick off TxDMA after preface was done */ if (pd->dma_direction == DMA_TO_DEVICE && pd->pos == 0) iic_set_clr(pd, ICIC, ICIC_TDMAE, 0); else if (sr & (ICSR_AL | ICSR_TACK)) /* don't interrupt transaction - continue to issue stop */ iic_wr(pd, ICSR, sr & ~(ICSR_AL | ICSR_TACK)); else if (pd->msg->flags & I2C_M_RD) wakeup = sh_mobile_i2c_isr_rx(pd); else wakeup = sh_mobile_i2c_isr_tx(pd); /* Kick off RxDMA after preface was done */ if (pd->dma_direction == DMA_FROM_DEVICE && pd->pos == 1) iic_set_clr(pd, ICIC, ICIC_RDMAE, 0); if (sr & ICSR_WAIT) /* TODO: add delay here to support slow acks */ iic_wr(pd, ICSR, sr & ~ICSR_WAIT); if (wakeup) { pd->sr |= SW_DONE; wake_up(&pd->wait); } /* defeat write posting to avoid spurious WAIT interrupts */ iic_rd(pd, ICSR); return IRQ_HANDLED; }